Taping The Hot Side

[terribleturner]

Ok, im installing my EGT and have drilled the hole in the Hot Side of the turbo but i just can't tap it :( the bit just goes round and doesn't bite :( Any ideas?? At this point im just gonna hammer the f'ing bose into it :banghead:

[Kranz]

You've drilled a hole too small or you have a non tapered tap?

You should have 2 taps, one a tapered starter tap and one a non tapered full tap.

What size tap (thread size) is it?

[terribleturner]

Ok, i have no idea what you said there :D

It's a 1/8npt i belive. The hole isn't too big YET. Im using just the one piece that i assume is called the tap. It's a drill bit like thing. Im winding it in to cut the thread but it's just not taking and going rouns and round. I'm scared to drill it anymore incase i go past the point of no return :(

[Kranz]

A 1/8 NPT tap should have an 8.5mm hole drilled first.

Does this look about the right size for the tap you have (i.e. the tap isn't bigger than 8.5mm diameter?).

[terribleturner]

Yeah that's right.

[Kranz]

And its still not taking?

[terribleturner]

No, just goes round and round and doesn't bite. :(

[Kranz]

Get a 10mm drill and just chamfer the top of the hole so it has a 45 degree edge, just to about 1mm down. This will help start the tap biting. Then push down hard on the bugger as you turn it!

Edit - Make sure you don't power the 10mm drill all the way through. Turn it by hand to prevent a mishap!

[terribleturner]

Ok, after just trying again it started to take ever so slightly and then stopped. So got the insert bose and with a screwdriver pushing against it with my belly :D and my spanner, i managd to get it in and stay. :clap:

Thanks for the help. Think i need to learn more about this tap and die business before i use it again :D

[Kranz]

Oh, and whan tapping you're supposed to go in half a turn then go a full turn back to clear the swarf from the thread cutting face otherwise it jams up... and lubricate it too :)

[terribleturner]

Definatly wasn't aware of that :(

[Kranz]

Ok, after just trying again it started to take ever so slightly and then stopped. So got the insert bose and with a screwdriver pushing against it with my belly :D and my spanner, i managd to get it in and stay. :clap:

Thanks for the help. Think i need to learn more about this tap and die business before i use it again :D

So have you cut a full thread or just jammed the boss in? :blink:

[merckx]

Have you tapped any holes before? :)

If not it would be wise to have a practice on a scrap piece of metal.

Too late. :D

[Jake]

As said above, you need to go back and forth only cutting a ¼ to ½ half turn each time. Take it slowly and you'll get there fine in the end.

[gzaerojon]

and get yourself a Zeus book (http://www.tooled-up.com/Product.asp?PID=6505&MAN=Zeus-Data-Chart-And-Referance-Tables-Book) so you know all the correct drill sizes to the holes you tap ;)

[terribleturner]

So have you cut a full thread or just jammed the boss in? :blink:
Eeerrr, not totally jammed :D it did cut a thread slightly and after making sure it was actually go in with thee help of my screwdriver i just had to wind it in more.


Have you tapped any holes before? :)

If not it would be wise to have a practice on a scrap piece of metal.

Too late. :D

Well my first ever try was on my vaccum source off the turbo. Worked fine :D


Next time will be in a couple of weeks for my new catch can. What do you use to lubricate it??

[gzaerojon]

What do you use to lubricate it??

i normally use normal 3 in one oil, but you can buy a cutting fluid from most engineering places.

i'll find a link


Edit: this sort of thing (http://www.lawson-his.co.uk/scripts/products.php?cat=Rocol%20Hand%20Applied%20Cutting%20Lubricants)

[G-NEMIE]

Ok, after just trying again it started to take ever so slightly and then stopped. So got the insert bose and with a screwdriver pushing against it with my belly :D and my spanner, i managd to get it in and stay. :clap:

Thanks for the help. Think i need to learn more about this tap and die business before i use it again :D

thank god for the belly

[terribleturner]

i normally use normal 3 in one oil, but you can buy a cutting fluid from most engineering places.

i'll find a link


Edit: this sort of thing (http://www.lawson-his.co.uk/scripts/products.php?cat=Rocol%20Hand%20Applied%20Cutting%20Lubricants)

Nice one :thumbs: thanks Jon

thank god for the belly

I always knew it was to serve a higher purpose :D

[Kranz]

What do you use to lubricate it??

Mostly any oil will be better than nothing